[subresource_filter] Don't populate metadata if we're suppressing UI

For abusive enforcement we don't want to show up in settings or
Page Info, so make sure we don't populate the metadata in cases
where we'd ship with suppress_notifications.

Bug: 756089
Change-Id: I31967339737005e432ded66f69e583b7b60635ab
Reviewed-on: https://chromium-review.googlesource.com/646792
Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#499098}
6 files changed